If there is really need for such a page, my first guess was, as i thought about it, to enter the content, which is responsible for the upload in a invisible frame.
For an invisible Frame you just have to make a frameset, where you only can see one part of the frame <frameset rows="*,1" or some like that, and on the other hand you are just making your transition page. after your upload is finished you just have to run a javascript parent.location.href="" command. Dont know if it works but just give it a try. mh, dont know if it really works, have no time yet, would be nice to know :)) Greetings Sascha
